The investigators are studying whether MSM plus standard of care naproxen improves symptoms of lower back pain compared to standard of care naproxen plus placebo. Subjects will be randomized into 1 of 2 groups. Group 1 will take by mouth 6000 milligrams (mgs) of MSM plus standard of care naproxen. Group 2 will take by mouth placebo capsules plus standard of care naproxen. Subjects will be instructed to take their study pills for 12 weeks and record on a study diary. They will then be followed up for one final visit 4 weeks later. RMDQ, PIQ-6, pain level, comprehensive metabolic panel (CMP), complete blood count (CBC) will be assessed at 4 week intervals for 12 weeks. Subjects' participation will last 16 weeks.